hcse设计知识点总结（HCSE design knowledge summary）.docVIP

hcse设计知识点总结（HCSE design knowledge summary） HCSE design points summary 1. in the wide area network design, in addition to considering the reliability, delay, cost and other factors, but also consider: through the WAN data flow, and standards and traditional network compatibility, easy configuration and maintenance, support remote access 2.DDN is defined as OSI model: the physical layer 3. when the remote user is mobile users and ISP are widely distributed, you can select the VPN service implementation of private network access, using VPN with which of the following characteristics: access to low cost, high safety, simple realization, ISP value-added services 4.X.25 (packet switching) technology belongs to the technology 5. for the use of local area network SOHO users, the most suitable (Quidway R1603/4) router remote access through the ISDN BRI interface 6.Ip Over and SDH IP Over ATM comparison, the following statement is correct: Ip Over SDH is commonly used in point-to-point links, IP Over ATM QOS IP Over ATM function, high cost and rich Ip Over SDH is more suitable for the popularization of the current 7. on the FR and the X.25 statement is correct: the delay of FR X.25 using a reliable data link layer protocol, X.25 network transmission The 8. packet switching network consists of the following components: packet switching node and network management center (NMC), assembly and disassembly equipment (PAD), packet terminal equipment 9. a central site via a serial link to the FR network, and the definition of the 5 virtual circuit respectively and 5 remote communication remote site, now unable to receive the routing update messages, after examination of the level of separation enabled by such method can solve the problem: enable sub interface, shut down the level of separation 10. a site is connected to a wide area network with a 256Kbps satellite circuit, and the transmission of rich business. Users are most concerned about is the transmission rate and cost, and can